4024/11 Oct/Nov 2024, Question 10: Simultaneous Equations by Elimination
Cambridge O Level Mathematics 4024 · Paper 11 (Non-calculator) · Non-calculator · 3 marks
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The question, in short
Solve the simultaneous equations 3a + b = −4 and 2a + 3b = 9, showing working.
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Solution · 3 marks
- 1Multiply the first equation by 3: 9a + 3b = −12
- 2Subtract 2a + 3b = 9: 7a = −21 so a = −3
- 33 × (−3) + b = −4 so b = 5
- 4a = −3, b = 5
Answera = −3, b = 5
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Also searched as: 4024/11/O/N/24 · 4024_w24_qp_11 · 4024 w24 11 · question 10.
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